10k miles OR 1 year. I put about 3k a year in my bike. And the recommended brand/type/viscosity oil cost me $40 for 6 quarts at Walmart. Plus $10 for a Triumph brand oil filter. So $50 in parts. I'll inspect the drain plug gaskets. If they need replacing, I will do so, but they will probably be fine. It's not about being cheap and skimping, it's about being practical. Why pay someone else an extra $250 dollars to do something I can do myself easily. I know what I'm doing. If I wanted to be a mechanic by trade, I could easily do so. My brother has offered me a job at a respectable rate on several occasions. The only reason I don't do it, is because my current job offers a company funded pension and practically free health care for me and all my dependents. Not worth giving that up for $7 more an hour.